Transmitting Apparatus and Interleaving Method Thereof

2. The transmitting apparatus of claim 1 , wherein the interleaver further comprises: a block interleaver configured to interleave the interleaved plurality of bit groups using a plurality of columns, each of the plurality of columns comprising a first part and a second part, wherein each of the plurality of columns is divided into the first part and the second part based on a modulation order for modulating.

3. The transmitting apparatus of claim 1 , wherein the π(j) is determined based on at least one of the code length of the codeword, a modulation method for the modulating an the code rate.